JPH11314355A - Method for forming image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow good water resistance, bleeding, character quality level, reproducibility and gradability of a color ink to be compatible. SOLUTION: The method for forming an image comprises the steps of giving a treating liquid containing at least cationic substance onto a medium to be recorded, and discharging a black ink containing at least an anionic dye and a color ink from a discharge orifice according to a record signal to give it to the medium in such a manner that the black ink and the color ink contain respective dense and pale inks and the liquid for the black ink and at least one type of a treating liquid for the color ink are different.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image forming method, and more particularly to a technique for obtaining a water-resistant image by reducing bleeding generated in the formation of a color image using ink. The present invention relates to an image forming method for quality tone recording.

[0002]

2. Description of the Related Art In an ink jet recording method, recording is performed by flying small ink droplets and attaching the ink to a recording medium such as paper. In particular, Japanese Patent Publication No. 61-59911
JP, JP-B-61-59912, JP-B-61-59912
According to the ink jet recording method disclosed in Japanese Patent Application Laid-Open No. 59914, in which an electrothermal converter is used as a discharge energy supply unit and droplets are discharged by applying thermal energy to ink to generate bubbles, High-density multi-orifices can be easily realized, and high-resolution and high-quality images can be recorded at high speed.

[0003] However, the ink used in the conventional ink jet recording method contains water as a main component and contains a water-soluble high-boiling solvent such as glycol for the purpose of preventing drying and preventing nozzle clogging. In general, when recording is performed on a recording medium using such an ink, sufficient fixability cannot be obtained, or a filler or a sizing agent on the surface of the recording paper as the recording medium cannot be used. Problems such as the occurrence of a non-uniform image estimated to be caused by the non-uniform distribution occur.

In particular, when a color image is to be obtained, a plurality of color inks are successively superimposed before a certain color ink is completely fixed on the recording paper. Color bleeding or uneven mixing at portions (hereinafter, this phenomenon is referred to as "bleeding") has caused a problem that a satisfactory image cannot be obtained.

On the other hand, as a means for improving the fixability, Japanese Patent Application Laid-Open No. 55-65269 discloses a method in which a compound for improving the permeability such as a surfactant is added to the ink. Japanese Patent Application Laid-Open No. 55-66976 discloses the use of an ink mainly containing a volatile solvent. However, in the former method in which a surfactant or the like is added to the ink, the permeability of the ink to the recording paper is increased, and although the fixing property and bleeding of the ink are improved to some extent, the coloring material in the ink is also used for the recording paper. Since it penetrates deeply, inconveniences such as a decrease in image density and saturation occur. In addition, the ink also spreads in the horizontal direction, and as a result, problems such as a decrease in edge sharpness and a decrease in resolution also occur. On the other hand, in the latter method using an ink mainly composed of a volatile solvent, in addition to the same disadvantages as in the former case described above, clogging due to evaporation of the solvent in the nozzle portion of the recording head occurs. Easy to do and not preferred.

Further, in order to improve the above-mentioned problem, there has been proposed a method in which a liquid composition for improving an image is applied to a recording medium in advance before the ejection of ink for recording a recording image. ing.

For example, Japanese Patent Application Laid-Open No. 63-60783 discloses a method in which a liquid composition containing a basic polymer is applied and then recording is performed using an ink containing an anionic dye. JP-A-63-22681 discloses a recording method in which a first liquid composition containing a reactive species and a liquid composition containing a compound which reacts with the reactive species are mixed on a recording medium. Further, JP-A-63-2999971 discloses that a liquid composition containing an organic compound having two or more cationic groups per molecule is applied onto a recording medium, and then an anionic dye is contained. A method for recording with ink is disclosed. JP-A-64-9279 discloses a method in which an acidic liquid composition containing succinic acid or the like is applied onto a recording medium, and recording is performed with an ink containing an anionic dye.
Furthermore, Japanese Patent Application Laid-Open No. 63-63185 discloses a method of applying a liquid composition for insolubilizing a dye prior to recording of ink.

[0008]

SUMMARY OF THE INVENTION In any of the above methods,
It is intended to suppress bleeding of the image and improve the water resistance by precipitation of the dye itself, but since the ink dots are smaller than the case where the liquid composition is not used due to the aggregation of the dye, the variation in the ejection amount of the ink is There is a problem that the image is easily affected by variations in the image and landing positions, and the solid uniformity of the image is easily reduced. The above-described problems have been the same even when performing gradation recording using dark and light inks.

The present invention has been made in view of the above circumstances to solve the following six problems. In other words, when ink-jet recording is performed on plain paper by the dark and light ink method, (1) character quality is good while having good fixing properties. (2) sufficient image density is obtained and solid uniformity is obtained. The goal is to increase

In particular, in forming a color image on plain paper by the dark and light ink method, (3) preventing bleeding (4) good color reproducibility and a high-definition image can be obtained (5) recording Good image water resistance (6) An object is to obtain an image with reduced graininess and excellent gradation.

[0011]

The above objects are achieved by the present invention described below. That is, in the present invention, a step (A) of applying a treatment liquid containing at least a cationic substance onto a recording medium, and discharging a black ink and a color ink containing at least an anionic dye from a discharge orifice according to a recording signal. In the image forming method including the step (B) of applying on a recording medium, the black ink and the color ink each have a dark and light ink, and the processing liquid for the black ink and at least one processing liquid for the color ink are different. An image forming method characterized by the following.

[0012]

Next, preferred embodiments of the present invention will be described, and the present invention will be described in more detail. In the image forming method of the present invention, a step (A) of applying a treatment liquid containing at least a cationic substance onto a recording medium, and discharging a black ink and a color ink containing at least an anionic dye from a discharge orifice according to a recording signal. The method of forming an image according to claim 1, wherein the black ink and the color ink each have a dark and light ink, and the processing liquid for the black ink and at least one processing liquid for the color ink are provided. It is different.

First, the processing liquid used in the present invention will be described. The essential component contained in the treatment liquid used in the present invention is a cationic substance, and more preferably contains at least one of (1) a low molecular cationic substance and (2) a cationic polymeric substance. preferable.

The cationic substance is not particularly limited as long as it has a cationic group in the molecule, but is preferably a cationic surfactant, cationic oligomer, polymer or the like.

First, preferred examples of cationic surfactants include compounds of salts of primary, secondary, and tertiary amines, such as laurylamine, cocoamine, stearylamine, and rosinamine. Hydrochloride, 4th
Compounds of the quaternary ammonium type, specifically, cetyltrimethylammonium chloride, lauryltrimethylammonium chloride, lauryltributylammonium chloride, benzalkonium chloride, and the like, an amphoteric surfactant showing a cationic property in a certain pH region, specifically an amino acid Examples thereof include those obtained by adjusting amphoteric surfactants, betaine-type compounds, and the like to have an isoelectric point or lower, but are not limited thereto. Among these compounds, quaternary ammonium compounds are particularly preferable.

Next, with regard to cationic oligomers and polymers, specific monomer units include vinylamine, allylamine, vinylpyridine, vinylimidazole, N, N-dimethylaminoacrylamide, ethyleneimine, 2-oxazoline and the like. However, of course, the present invention is not limited to these.

In addition to the above-mentioned homopolymer of a cationic monomer unit, a copolymer with a nonionic monomer unit, a nonionic oligomer, or a polymer obtained by partially polymerizing a part of a polymer may be used. It is possible. Among these compounds, oligomers and polymers containing allylamine as a unit are particularly preferable.

Further, when a low molecular weight cationic surfactant and polyallylamine are used in combination, the bleeding of a different color boundary can be reduced at the time of color recording. Therefore, the above combination is particularly suitable for color recording.

The amount of the cationic substance contained in the above-mentioned processing solution is 0.05 to 20 with respect to the total amount of the processing solution.
% By weight is a suitable range, more preferably 0.5 to 5%.
Although it is in the range of weight%, it is necessary to determine the optimum range depending on the combination of the substances used.

Next, other components constituting the processing solution used in the present invention will be specifically described. The treatment liquid used in the present invention is usually, in addition to the above-mentioned cationic substance,
Consists of water, water-soluble organic solvents and other additives.

The water-soluble organic solvent used in the present invention includes amides such as dimethylformamide and dimethylacetamide; ketones such as acetone; ethers such as tetrahydrofuran and dioxane; polyalkylenes such as polyethylene glycol and polypropylene glycol. Glycols; ethylene glycol, propylene glycol, butylene glycol, triethylene glycol,
1,2,6-hexanetriol, thiodiglycol,
Alkylene glycols such as hexylene glycol and diethylene glycol; lower alkyl ethers of polyhydric alcohols such as ethylene glycol methyl ether, diethylene glycol monomethyl ether and triethylene glycol monomethyl ether; ethanol, isopropyl alcohol, n-butyl alcohol and isobutyl alcohol And other monohydric alcohols; other, glycerin, N
-Methyl-2-pyrrolidone, 1,3-dimethylimidazolidinone, triethanolamine, sulfolane, dimethyl sulfoxide and the like are used. The content of the water-soluble organic solvent is not particularly limited, but is preferably 5 to 60% by weight, more preferably 5 to 40% by weight, based on the total amount of the liquid.

Further, the processing liquid used in the present invention may further include a viscosity adjuster, a pH adjuster, a preservative,
Additives such as a surfactant, an antioxidant, and an evaporation accelerator may be appropriately blended. The selection of the surfactant is particularly important in adjusting the permeability of the processing liquid into the recording medium.

The processing liquid used in the present invention is more preferably colorless, but may be a light-colored liquid that does not change the color tone of each color ink when mixed with the ink on a recording medium or the like. Further, as a suitable range of various physical properties of the treatment liquid as described above, the pH at around 25 ° C. is 3 to 12, preferably 3 to 8, more preferably 3 to 5, and the surface tension is 10 to 60 dyn. / Cm, preferably 10 to 40 dyn
/ Cm and a viscosity of 1 to 30 cps.

Next, the recording ink used in the present invention will be described. The recording ink has one dark ink and one light ink each having a different dye concentration for the same color. An essential component of each of the light and dark inks is a water-soluble dye having at least an anionic group.

The recording ink contains a water-soluble dye having at least an anionic group as a colorant, and further contains water, a water-soluble organic solvent and other components such as a viscosity adjuster and a pH adjuster. , A preservative, a surfactant, an antioxidant and the like are included as necessary.

The water-soluble dye having an anionic group used in the present invention includes a color index (COLOUH).
R INDEX), water-soluble acid dyes described in
It is not particularly limited as long as it is a direct dye or a reactive dye. or,
There is no particular limitation on those not described in the color index as long as they have an anionic group such as a sulfone group and a carboxyl group. The water-soluble dyes mentioned here naturally include those having a pH dependence of solubility.

The content of the water-soluble dye in the ink is as follows:
The dark ink preferably has a concentration of 2 to 5% by weight, and the light ink has a concentration of 1/10 to 1/4 of the dark ink.

The water-soluble organic solvent contained in the ink containing a water-soluble dye as a coloring material as described above includes:
The water-soluble organic solvent used in the treatment liquid used in the present invention can be used in the same manner. The same applies to the preferred range of the content of these water-soluble organic solvents in the ink. Further, the preferable physical property range of the ink is exactly the same as that of the processing liquid.

Further, in order to make the present invention more effective, in addition to the various components described above, an anionic surfactant or an anionic polymer such as an anionic polymer may be added to the ink. You may add an acidic compound. Further, the amphoteric surfactant may be contained after adjusting to a pH below its isoelectric point. Examples of the anionic surfactant used in this case include carboxylate type, sulfate type, sulfonate type, and phosphate type, and any of those generally used can be preferably used. . Examples of anionic polymer substances include alkali-soluble resins,
Specific examples thereof include sodium polyacrylate and those obtained by copolymerizing acrylic acid with a part of a high molecular substance, but are not limited thereto.

In the image forming method of the present invention, a step (A) of applying a treatment liquid containing at least a cationic substance onto a recording medium, and discharging a black ink and a color ink containing at least an anionic dye in accordance with a recording signal. The method includes a step (B) of discharging the ink from an orifice onto the recording medium, and the step (A) aims at achieving both good print quality and improved fixability of the recorded image formed in the step (B). It is intended for the purpose of preventing bleeding and improving the water resistance of the image. Even if the step (A) is performed prior to the step (B), the step (A) is performed after the step (B). No problem. This is because, in either case, the cationic substance in the treatment liquid and the anionic substance in the ink are mixed on the recording medium to form an aggregate. From the viewpoint of improving the image density and the uniformity of the solid image, the step (A) is performed after the step (B),
More preferably, the step (B) is performed subsequently.

In the present invention, as the step (A), that is, a method of attaching the treatment liquid to the recording medium, a method of attaching the treatment liquid to the entire surface of the recording medium by, for example, a spray or a roller is conceivable. It is preferable to use an ink-jet method in which the processing liquid can be selectively and uniformly applied only to the image forming area to which the ink adheres, or to the image forming area and the vicinity of the image forming area.

Various ink jet systems can be used as a method for depositing the treatment liquid on the recording medium, but a particularly preferable method is to use a so-called on-off method in which droplets are discharged using bubbles generated by thermal energy. It is a demand type thermal inkjet system.

In the case where the step (A) is carried out prior to the step (B), the time from when the processing liquid is applied to the recording medium until the ink is applied is not particularly limited. Is made within several seconds, particularly preferably within one second, in order to make the effect more effective. The same applies to the case where the step (A) is performed after the step (B).

In the present invention, by using a different processing liquid for the black ink and at least one type of processing liquid for the color ink other than the black ink, a processing liquid common to the black ink and the color ink is used. However, the effect of emphasizing the improvement of the character quality of the black ink and the improvement of the color development and saturation of the color ink can be achieved by using different processing liquids.

The recording medium used in the present invention is not particularly limited as to the recording medium used in carrying out the present invention, and so-called plain paper such as copy paper and bond paper conventionally used is not limited. It is preferably used. Of course, coated paper and OHP transparent film specially created for inkjet recording are also suitably used,
It can be suitably used for general high-quality paper and glossy paper.

Next, a recording apparatus for carrying out the present invention will be described. The present invention preferably employs a method in which a recording signal is applied to the ink of the recording head and droplets are ejected by the generated thermal energy. FIGS. 1, 2 and 3 show examples of the configuration of a head which is a main part of the apparatus.

The head 13 includes a glass, ceramic or plastic plate having a groove 14 through which ink passes, and a heating head 15 having a heating resistor used for thermal recording (the head is shown in the figure, but is not limited to this. Is not obtained). The heating head 15 includes a protective film 16 made of silicon oxide or the like, and the aluminum electrode 1.
7-1 and 17-2, a heating resistor layer 18 made of nichrome or the like, a heat storage layer 19, and a substrate 20 having good heat dissipation such as alumina.

The ink 21 has a discharge orifice (fine hole) 2
The meniscus 23 is formed by a pressure (not shown).

When an electric signal is applied to the electrodes 17-1 and 17-2, the area of the heating head 15 indicated by n rapidly generates heat, and bubbles are generated in the ink 21 in contact with the area.
The meniscus 23 is protruded by the pressure, the ink 21 is ejected, becomes a recording droplet 24 from the orifice 22, and flies toward the recording material 25.

FIG. 3 is an external view of a multi-head in which a number of nozzles shown in FIG. 1 are arranged. The multi-head is manufactured by closely contacting a glass plate 27 having a multi-groove 26 and a heating head 28 similar to that described with reference to FIG.

FIG. 1 shows a head 1 along an ink flow path.
3 is a sectional view, and FIG. 2 is a cross-sectional view taken along a line AB in FIG. FIG. 4 shows an example of an ink jet recording apparatus incorporating such a head. In FIG. 4, reference numeral 61 denotes a blade as a wiping member, one end of which is held by a blade holding member to become a fixed end, and forms a cantilever. The blade 61 is provided at a position adjacent to a recording area of the recording head.

Further, in the case of this embodiment, the recording head is held in a form protruding into the moving path of the recording head. 62 is a cap,
It is arranged at the home position adjacent to the blade 61,
The recording head is configured to move in a direction perpendicular to the direction of movement of the recording head, contact the ejection port surface, and perform capping. 6 more
Reference numeral 3 denotes an ink absorber disposed adjacent to the blade 61, and is held in a form protruding into the movement path of the recording head, similarly to the blade 61. The blade 61, the cap 62, and the ink absorber 63 constitute an ejection recovery unit 64, and the blade 61 and the ink absorber 63 remove moisture, dust, and the like from the ink ejection port surface.

Reference numeral 65 denotes a recording head which has discharge energy generating means and performs recording by discharging ink onto a recording material opposed to the discharge port surface where discharge ports are arranged. Reference numeral 66 denotes a recording head on which the recording head 65 is mounted. And a carriage for moving the recording head 65. The carriage 66 is slidably engaged with the guide shaft 67, and a part of the carriage 66 is connected to a belt 69 driven by a motor 68 (not shown).
As a result, the carriage 66 can move along the guide shaft 67, and the recording head 65 can move the recording area and the adjacent area.

Reference numeral 51 denotes a feeding portion for inserting a recording material, and reference numeral 52 denotes a feed roller driven by a motor (not shown). With such a configuration, the recording material is fed to a position facing the discharge port surface of the recording head, and is discharged to a discharge unit provided with a discharge roller 53 as recording proceeds.

In the above configuration, when the recording head 65 returns to the home position at the end of recording or the like, the head recovery unit 6
The cap 62 of 4 is retracted from the moving path of the recording head 65, but the blade 61 protrudes into the moving path. As a result, the ejection port surface of the recording head 65 is wiped. When capping is performed with the cap 62 in contact with the ejection surface of the recording head 65, the cap 62 moves so as to protrude into the movement path of the recording head.

When the recording head 65 moves from the home position to the recording start position, the cap 62 and the blade 61 are at the same position as the position at the time of wiping. As a result, even in this movement, the ejection port surface of the recording head 65 is wiped.

The movement of the print head to the home position is performed not only at the end of printing or at the time of ejection recovery, but also at a predetermined interval while the print head moves through the printing area for printing. Position, and the wiping is performed along with the movement.

FIG. 5 is a view showing an example of an ink cartridge containing ink supplied to the head via an ink supply member, for example, a tube. Here, reference numeral 40 denotes an ink storage portion that stores the supply ink, for example, an ink bag, and a rubber stopper 42 is provided at the tip thereof. By inserting a needle (not shown) into this stopper 42,
The ink in the ink bag 40 can be supplied to the head. An ink absorber 44 receives the waste ink. It is preferable for the present invention that the ink container has a liquid contact surface made of polyolefin, particularly polyethylene.

The ink jet recording apparatus used in the present invention is not limited to the one in which the head and the ink cartridge are separated from each other as described above, but is also suitable for the one in which they are integrated as shown in FIG. Used.

In FIG. 6, reference numeral 70 denotes a recording unit, in which an ink storage portion for storing ink, for example, an ink absorber is stored, and the ink in the ink absorber has a plurality of orifices. Head part 71
Are ejected as ink droplets from the ink. As the material of the ink absorber, it is preferable for the present invention to use polyurethane, cellulose or polyvinyl acetate.

Reference numeral 72 denotes an atmosphere communication port for communicating the inside of the recording unit with the atmosphere. This recording unit 70
It is used in place of the recording head shown in FIG. 4, and is detachable from the carriage 66.

In the recording apparatus used in the present invention,
In the above, an ink jet recording apparatus that ejects ink droplets by applying thermal energy to ink has been described as an example, but the present invention can be similarly applied to other ink jet recording apparatuses such as a piezo method using a piezoelectric element. .

When carrying out the image forming method of the present invention, a printing apparatus in which three printing heads are arranged on a carriage as shown in FIG. 7 is used. Each recording head 81-82
Are recording inks for ejecting black (Bk), yellow (Y), cyan (C), and magenta (M) dark inks, light inks, and processing liquids for these inks, respectively. The density of the recording ink is black (B
k), yellow (Y), cyan (C), magenta (M)
The liquid flow path is divided into each color ink, and the ink of each density is discharged according to the recording signal. The processing liquid recording head is also divided into liquid channels so that different types of processing liquids can be applied to each color of black (Bk), yellow (Y), cyan (C), and magenta (M).

[0054]

EXAMPLES The present invention will be specifically described below with reference to examples. However, parts and percentages are by weight unless otherwise specified.

Examples 1 and 2 and Comparative Example 1 (Treatment Solution 1) PAA-HCl; polyallylamine hydrochloride (MW = 850) 2 parts G50; benzalkonium chloride 1 part diethylene glycol 10 parts water 87 parts

(Treatment liquid 2) PAA-HCl; 2.5 parts of polyallylamine hydrochloride (MW = 1000) G50; 0.1 part of benzalkonium chloride 10 parts of diethylene glycol 10 parts of water 87.4 parts

(Treatment Liquid 3) PAS-A-5; polyamine sulfone hydrochloride (MW = 3500) 5 parts Diethylene glycol 10 parts Water 85 parts

(Yellow Dark Ink 1) Dye represented by the following structural formula (1) 2.5% Diethylene glycol 10% Acetylenol EH 0.1% (trade name, manufactured by Kawasaki Fine Chemical Co., Ltd.) Water 87.4%

[0059]

Embedded image

(Yellow light ink 1) Same dye as yellow deep ink 1 0.5% diethylene glycol 10% acetylenol EH 0.1% water 89.4%

(Magenta Dark Ink 1) Dye represented by the following structural formula (2) 3% Diethylene glycol 10% Acetylene EH 0.1% Water 86.9%

[0062]

Embedded image

(Magenta light ink 1) Same dye as magenta dark ink 1 0.6% diethylene glycol 10% acetylenol EH 10% water 79.4%

(Cyan Deep Ink 1) C.I. I. Direct Blue 199 3.5% Diethylene glycol 10% Acetylenol EH 0.1% Water 86.4%

(Cyan Light Ink 1) C.I. I. Direct Blue 199 0.6% Diethylene glycol 10% Acetylenol EH 0.1% Water 89.3%

(Black Dark Ink 1) C.I. I. Food black 2 3% Diethylene glycol 10% IPA 4% Water 83%

(Black Light Ink 1) C.I. I. Food black 2 0.6% Diethylene glycol 10% IPA 4% Water 85.4% The recording method was as follows, using a combination of the ink and the processing liquid shown in Table 1 below, and using the apparatus shown in FIG. Was used to form a color image. The recording head used here has a recording density of 360 dpi, a driving frequency of 5 kHz, and an ejection volume per dot of 40 pl / dot for each of yellow, magenta, and cyan inks and a processing liquid. For the black ink, a head of 80 pl / dot was used.

The evaluation of the recorded image was performed by the following method. 1. Gradation A half-tone image was formed using a total of six color inks of yellow, cyan, and magenta and a processing liquid, and the granularity of the image was visually evaluated. ○, if the graininess is reduced compared to when a halftone image is formed only with dark ink,
If they are equivalent, it was evaluated as ×.

2. Water resistance Each solid image and alphanumeric characters of each color were printed using each of the dark inks of yellow, cyan, magenta, and black and the processing liquid, and left for 1 hour, then immersed in tap water at a water temperature of 20 ° C. for 10 seconds. . Then, it was taken out of the water, air-dried, and visually evaluated for water resistance. Yellow, cyan, magenta,
Among blacks, the ink having the lowest water resistance was evaluated as the water resistance. A: There is no flow of the recording agent into the margin portion, and almost no soiling is observed. Almost no bleeding of alphanumeric characters has occurred. ：: The flow to the margin is slightly generated and the alphanumeric characters are slightly blurred, but this is a level that does not cause any problem in actual use. X: The flow of the recording agent into the margin was severe, and the background dirt was severe. The bleeding of alphanumeric characters is also terrible.

3. Bleeding A solid image of each color was printed adjacently using the treatment liquid and each of the dark inks of yellow, cyan, magenta, and black, and the degree of bleeding at the boundary between the colors was visually evaluated.
Among the yellow, cyan, magenta, and black inks, the ink having the least bleeding was evaluated as the evaluation result. A: Almost no bleeding occurred. ：: Slight bleeding occurs, but there is practically no problem. ×: Other levels.

4. Character quality Black alphanumeric characters were printed using the processing liquid and dark black ink, and evaluated visually. A: Feathering is hardly noticeable. ：: Feathering occurs slightly, but there is practically no problem. ×: Other levels.

Table 2 below shows the results of the evaluation of the recorded images.

[0073]

[Table 1]

[0074]

[Table 2]

[0075]

As described above, according to the present invention, at least one processing liquid different from the black ink is applied to the dark and light color ink, so that good water resistance, bleeding, character quality and color ink can be obtained. The effect that can achieve both color reproducibility and gradation can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a head section of an ink jet recording apparatus.

FIG. 2 is a cross-sectional view of a head section of the inkjet recording apparatus.

FIG. 3 is an external perspective view of a head unit of the inkjet recording apparatus.

FIG. 4 is a perspective view illustrating an example of an ink jet recording apparatus.

FIG. 5 is a vertical sectional view of the ink cartridge.

FIG. 6 is a perspective view of a recording unit.

FIG. 7 is a perspective view of another recording head used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Head 14 Ink groove 15, 28 Heating head 16 Protective film 17-1, 17-2 Aluminum electrode 18 Heating resistor layer 19 Heat storage layer 20 Substrate 21 Ink 22 Discharge orifice (fine hole) 23 Meniscus 24 Recording droplet 25 Recording Material 26 Multi-groove 27 Glass plate 28 Heating head 40 Ink storage unit 42 Plug 44 Ink absorber 45 Ink cartridge 51 Supply unit 52 Feed roller 53 Discharge roller 61 Blade 62 Cap 63 Ink absorber 64 Discharge recovery unit 65 Recording head 66 Carriage 70 Recording unit 71 Head 72 Atmosphere communication port

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinya Shinya 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Eriko Ono 3- 30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside (72) Inventor Yutaka Kurabayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (1)

[Claims] 1. A step (A) of applying a treatment liquid containing at least a cationic substance onto a recording medium, and discharging a black ink and a color ink containing at least an anionic dye from an ejection orifice in accordance with a recording signal. In the image forming method having the step (B) of applying on a recording medium, it is preferable that the black ink and the color ink have dark and light inks respectively, and that a processing liquid for the black ink and at least one processing liquid for the color ink are different. Characteristic image forming method.